Inspector Error

I have started using Odin today. I’m not sure if it is its fault, but I started creating Scriptable Objects in my new project. I did this:

public abstract class Ability : ScriptableObject
	{
	    public string aName = "Ability";
	    public Sprite aSprite;

	    public AudioClip aSound;
	    public float baseCoolDown = 1f;

	    public abstract void Initialize(GameObject obj);
	    public abstract void TriggerAbility();
      }

Now, whenever I try to change aSprite, aSound or play the game I get these two errors:

UnityException: set_type is not allowed to be called from a ScriptableObject constructor (or instance field initializer), call it in OnEnable instead. Called from ScriptableObject 'ObjectSelector'.
See "Script Serialization" page in the Unity Manual for further details.
UnityEngine.Event.KeyboardEvent (System.String key) (at C:/buildslave/unity/build/Modules/IMGUI/Event.cs:153)
UnityEditor.ObjectSelector..cctor () (at C:/buildslave/unity/build/Editor/Mono/ObjectSelector.cs:78)
Rethrow as TypeInitializationException: An exception was thrown by the type initializer for UnityEditor.ObjectSelector

set_type is not allowed to be called from a ScriptableObject constructor (or instance field initializer), call it in OnEnable instead. Called from ScriptableObject 'ObjectSelector'.
See "Script Serialization" page in the Unity Manual for further details.
UnityEditor.ObjectSelector:.cctor()

Any ideas what my be the reason?

I had the same error that would even show on a newly created project (with no extra packages installed).

Edit->Preferences->GI Cache-> Clean Cache

Edit->Preferences->Cache Server-> Clean Cache

Fixed the problem for me. Hope it helps someone else cause it drove me crazy.